Bump postcss from 8.4.30 to 8.4.31 in /e2e/web-tests (#2623)

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.30 to
8.4.31.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/postcss/postcss/releases">postcss's
releases</a>.</em></p>
<blockquote>
<h2>8.4.31</h2>
<ul>
<li>Fixed <code>\r</code> parsing to fix CVE-2023-44270.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/postcss/postcss/blob/main/CHANGELOG.md">postcss's
changelog</a>.</em></p>
<blockquote>
<h2>8.4.31</h2>
<ul>
<li>Fixed <code>\r</code> parsing to fix CVE-2023-44270.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/postcss/postcss/commit/90208de8805dd762596c0028b8637ffbed23e371"><code>90208de</code></a>
Release 8.4.31 version</li>
<li><a
href="https://github.com/postcss/postcss/commit/58cc860b4c1707510c9cd1bc1fa30b423a9ad6c5"><code>58cc860</code></a>
Fix carrier return parsing</li>
<li><a
href="https://github.com/postcss/postcss/commit/4fff8e4cdc237619df1d73a444c0a8329701c1e2"><code>4fff8e4</code></a>
Improve pnpm test output</li>
<li><a
href="https://github.com/postcss/postcss/commit/cd43ed123274a92ebc13a1e8cccf1d65b8198f84"><code>cd43ed1</code></a>
Update dependencies</li>
<li><a
href="https://github.com/postcss/postcss/commit/caa916bdcbf66c51321574e2dde112ab13e8b306"><code>caa916b</code></a>
Update dependencies</li>
<li><a
href="https://github.com/postcss/postcss/commit/8972f76923e921a3c9655822382039b31b1c8e1a"><code>8972f76</code></a>
Typo</li>
<li><a
href="https://github.com/postcss/postcss/commit/11a5286f781d2a637f2c545c5e9cd661055acaab"><code>11a5286</code></a>
Typo</li>
<li>See full diff in <a
href="https://github.com/postcss/postcss/compare/8.4.30...8.4.31">compare
view</a></li>
</ul>
</details>
<br />


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e2e/web-tests/yarn.lock

@@ -7010,9 +7010,9 @@ postcss-value-parser@^4.1.0, postcss-value-parser@^4.2.0:
   integrity sha512-1NNCs6uurfkVbeXG4S8JFT9t19m45ICnif8zWLd5oPSZ50QnwMfK+H3jv408d4jw/7Bttv5axS5IiHoLaVNHeQ==
 
 postcss@^8.3.5, postcss@^8.4.21, postcss@~8.4.21:
-  version "8.4.30"
-  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.4.30.tgz#0e0648d551a606ef2192a26da4cabafcc09c1aa7"
-  integrity sha512-7ZEao1g4kd68l97aWG/etQKPKq07us0ieSZ2TnFDk11i0ZfDW2AwKHYU8qv4MZKqN2fdBfg+7q0ES06UA73C1g==
+  version "8.4.31"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.4.31.tgz#92b451050a9f914da6755af352bdc0192508656d"
+  integrity sha512-PS08Iboia9mts/2ygV3eLpY5ghnUcfLV/EXTOW1E2qYxJKGGBUtNjN76FYHnMs36RmARn41bC0AZmn+rR0OVpQ==
   dependencies:
     nanoid "^3.3.6"
     picocolors "^1.0.0"